This is a quick, how to make a base for cheap Styrofoam tombstones so they will stand up and look nicer. I used 2x2 for small tombstones in the front and back with 1x2 on the sides and 1x4 for larger ones. I measured the base of the tombstone I was working on, cut 2, then measured the sides with the tombstone between the 2 2x2 pieces of wood. Pre drill 2 holes on the sides for your screws. When putting in the screws, make sure the wood is tightly holding the Styrofoam. For a nicer look, add a piece of larger wood on the bottom for more base.
Then I painted each base gray before applying spray paint to make it look like stone. Each tombstone took me a little less than 10 minutes. If you wanted it to look really nice, I'd put wood filler in the joints of the wood to hide all the seams. Even with the vase, these tombstones can be blown over in higher winds. You can drill holes in the sides of the wood and use tent stakes or sandbags.
I decided to drill 1/2 holes into the bottom of the base and put a 1/2 piece of dowel into the hole. I stuck the dowel into the ground and so far, the tombstones have stayed up really well. I didn't glue the dowels in so I can remove them for easier storage later.
Read after pictures to see how they stood up to the weather.
We had some pretty bad winds and heavy rains over halloween and I only lost 2 out out 25 tubs tones. Those 2 broke the Styrofoam right at the base of the wood. None tipped over though! To prevent breakage, you could drill a 1/2 hole on the top edge of the base in the back and glue a 1/2 dowel inserted into the hole, painted. I gray onto the back of the tombstone. There's no way your tombstones will tip over or break and you can use them for many years.